Kim Sang-Myeong, Choi Wonjae
Department of Mechatronics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Puk-gu, Gwangju, 500-712, Korea.
J Acoust Soc Am. 2005 Jun;117(6):3657-65. doi: 10.1121/1.1921548.
In-head localization of sound images is a critical problem in headphone reproduction. The paper investigates the degree of externalization in terms of the distance of auditory images for various synthesis and reproduction cases. An effective binaural headphone system was constructed by way of binaural synthesis using head-related impulse responses and individual headphone equalization using Wiener filter theory. The headphone system designed had an average reproduction performance error of 2.4% for five subjects with a random noise input, and was used to perform some subjective tests with a set of virtual sources equally spaced and distanced from the center of each subject's head in the horizontal plane. The effects of individual and nonindividual binaural syntheses and those of equalized and nonequalized reproductions were separately investigated. In the tests, each subject was instructed to indicate the distance of auditory images. The results obtained demonstrate that individual equalization is important for externalization, and individual synthesis is important for consistent distance perception. Thus, a combined use of both individual equalization and individual synthesis resulted in externalized sound images of a consistent distance.
声音图像的头部内定位是耳机重放中的一个关键问题。本文根据各种合成和重放情况下听觉图像的距离来研究声音外显化的程度。通过使用头部相关脉冲响应进行双耳合成以及利用维纳滤波理论进行个体耳机均衡，构建了一个有效的双耳耳机系统。所设计的耳机系统在随机噪声输入时，对五名受试者的平均重放性能误差为2.4%，并用于对一组在水平面上与每个受试者头部中心等距且等间隔的虚拟声源进行一些主观测试。分别研究了个体和非个体双耳合成以及均衡和非均衡重放的效果。在测试中，指示每个受试者指出听觉图像的距离。所获得的结果表明，个体均衡对于声音外显化很重要，而个体合成对于一致的距离感知很重要。因此，个体均衡和个体合成的联合使用产生了距离一致的外显化声音图像。
